From what you are saying, it appears that California would have Jurisdiction to decide the case. If you are aware of the case, you should appear and give your side of the story and ask for the orders you want to have. If you choose not to appear, the Court will make orders without you there. They do not need your signature, although they do need to make sure you are served with the paperwork. If they cannot find you to serve you the paperwork, they can serve you by publication in a local newspaper, then move forward with the case without you there.
Answered on Apr 14th, 2013 at 9:32 PM